CN107913978A - A kind of speed constrictive type precoated sand - Google Patents
A kind of speed constrictive type precoated sand Download PDFInfo
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- CN107913978A CN107913978A CN201711235789.9A CN201711235789A CN107913978A CN 107913978 A CN107913978 A CN 107913978A CN 201711235789 A CN201711235789 A CN 201711235789A CN 107913978 A CN107913978 A CN 107913978A
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- precoated sand
- phenol
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- constrictive type
- fast
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
Abstract
The present invention relates to a kind of precoated sand, and in particular to a kind of speed constrictive type precoated sand, belongs to precoated sand material field.Speed constrictive type precoated sand of the invention specifically includes the component of following parts by weight：Natural silica sand：80 90 parts, phenol-formaldehyde resin modified：15 20 parts, imidazoles：25 parts, salicylic acid：28 parts, water：58 parts, Fe3O4:25 parts, calcium stearate：5 10 parts.Speed constrictive type precoated sand of the invention uses binding agent of the phenol-formaldehyde resin modified as aggregate in succession, while using curing agent of the hexamethylenetetramine aqueous solution as phenol-formaldehyde resin modified, the use of methenamine can be avoided, so as to reduce the pollution of ammonia；Meanwhile the fast constrictive type precoated sand of the present invention is modified phenolic resin with urea using Wheat Straw Lignin from Alkali Pulping, while imidazoles and salicylic acid are added in precoated sand, can make obtained precoated sand that there is heat resistance and toughness.
Description
Invention field
The present invention relates to a kind of precoated sand, and in particular to a kind of speed constrictive type precoated sand, belongs to precoated sand material field.
Background technology
Traditional mold manufacturing uses common river sand, and manufactured model is more open, and intensity is low, and the utilization rate of sand
Relatively low, discarded sand carries substantial amounts of harmful substance, can not effectively recycle, pollution is caused to environment.Precoated sand refers to make
The molding sand or sand core of one layer of hard resin are covered before type in sand grain surface, because its intensity is high, gas forming amount is low, production casting dimension essence
The advantages that high is spent, is got a lot of applications in recent years in mechanical manufacturing field, but also there is hardening speed for existing precoated sand
Spending the problem of slow needs further improve.
The content of the invention
The present invention is in view of the above-mentioned problems existing in the prior art, it is proposed that a kind of speed constrictive type precoated sand.
The purpose of the present invention is realized by following technical solution：A kind of speed constrictive type precoated sand, the speed constrictive type cover
Film sand specifically includes the component of following parts by weight：Natural silica sand：80-90 parts, phenol-formaldehyde resin modified：15-20 parts, imidazoles：2-5
Part, salicylic acid：2-8 parts, water：5-8 parts, Fe3O4:2-5 parts, calcium stearate：5-10 parts.
In speed hardening precoated sand of the invention, the present invention, as aggregate, adds modified phenolic resin by using natural silica sand
Binding agent of the fat as aggregate in succession, and add hexamethylenetetramine aqueous solution and substitute methenamine as phenol-formaldehyde resin modified
Curing agent.
In a kind of above-mentioned fast constrictive type precoated sand, by using natural silica sand as aggregate, contain in natural silica sand
90% and the silica of the above, and there is high refractoriness, generally more than 1700 DEG C, especially, the group of natural silica sand
It is neat into epigranular, evening ratio all 90% and more than, thin rate is relatively low, and gas permeability is excellent, and the aggregate as precoated sand uses,
Precoated sand made of being conducive to has excellent performance.
In addition, the present invention uses binding agent of the phenol-formaldehyde resin modified as aggregate in succession, the system of the phenol-formaldehyde resin modified
Preparation Method specifically comprises the following steps：It is changing for phenol quality 2.1-2.5% by phenol, hexamethylenetetramine aqueous solution, quality
Property agent be added in formalin, mechanical agitation 3-4h, and add ammonia spirit, temperature rising reflux 1-1.5h, after decompression dehydration plus
Enter ethylene glycol, discharge after stirring.In fast constrictive type precoated sand of the invention, the modifying agent is Wheat Straw Lignin from Alkali Pulping and urea
Mixture, and mass ratio is (1.2-1.4)：1.
Speed constrictive type precoated sand of the invention changes phenolic resin as modifying agent with urea using Wheat Straw Lignin from Alkali Pulping
Property.After being reacted, the condensation between active hydrogen on methylol and methylol or phenol core, forms methylene or ehter bond connects
Connect, mainly connected between condensation polymer by methene key.Since condensation course produces a small amount of low-molecular material, low point
Sub- thing volatilization heat absorption and curing exotherm collective effect, make cure profile peak shape shallower, therefore, at that same temperature, change
Phenolic resin curing speed after property is considerably more rapid.Meanwhile in modified phenolic resin also containing copolycondensation methylene bridged bond-
CH2NHCO-, illustrates that modified phenolic resin curing speed is significantly larger than unmodified phenolic resin.
In fast constrictive type precoated sand of the invention, by adding imidazoles, reaction can be cured at low temperature, due to miaow
There are two nitrogen-atoms in azoles ring, the formation of big aromatic gp pi bond in the lone electron pair remnants rings of 1 nitrogen-atoms, and 3 nitrogen-atoms
Lone electron pair does not have then, therefore than 1 nitrogen-atoms of the alkalescence of 3 nitrogen-atoms is strong, mainly plays catalytic action, reactivity is big.This
Invention can accelerate the generation of curing reaction by adding imidazoles.
In fast constrictive type precoated sand of the invention, by adding salicylic acid, catalyst can be used as.Due to point of phenolic resin
Contain carboxyl in subchain, under bigcatkin willow acid catalysis the solidification of phenolic resin can accelerate, and calorific intensity is also higher,
It can make obtained precoated sand curing and high intensity soon.
In fast constrictive type precoated sand of the invention, the concentration of the hexamethylenetetramine aqueous solution is 75-79%.Six first
Urotropine aqueous solution is added as the curing agent of phenol-formaldehyde resin modified, can not only substitute methenamine, and can promote phenolic aldehyde
The modified-reaction of resin occurs, and is conducive to the generation of the electrophilic substitution reaction of formaldehyde Pyrogentisinic Acid, makes resin polymerization degree larger, Gu
Content, carbon residue, viscosity etc. all improve.
In fast constrictive type precoated sand of the invention, the addition of the formalin and the mass ratio of phenol are (1.2-
1.4)：1, the mass fraction of the formalin is 37-45%.
In a kind of above-mentioned fast constrictive type precoated sand, a small amount of water is added, as the solvent of hexa it can be made equal
It is even to be distributed on resin film；Cooling effect can be played at the same time, shortens precoated sand incorporation time, improve productivity.
In a kind of above-mentioned fast constrictive type precoated sand, by adding calcium stearate, be conducive to improve or prevent precoated sand from storing up
Lump during depositing, increase the mobility of precoated sand, make the shell core surface compact made, and its intensity can be improved, while also have
Beneficial to the liftability for improving shell core.
In a kind of above-mentioned fast constrictive type precoated sand, by adding Fe3O4, help to reduce bleb, while reduce casting
Steel part oozes C, while prevents casting vein and steel-casting orange peel defects.
It is another object of the present invention to provide a kind of preparation method of above-mentioned fast constrictive type precoated sand, the preparation side
Method specifically comprises the following steps：
Weigh and be kneaded：Silicon sand is weighed, is heated to 150-170 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, hard
Resin acid calcium and Fe3O4, it is kneaded 50-60s and obtains mixture；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
In a kind of above-mentioned preparation method of fast constrictive type precoated sand, the temperature of the flowing cooling agent is 40-50 DEG C.
Compared with prior art, the invention has the advantages that：
1st, the fast constrictive type precoated sand of the present invention uses binding agent of the phenol-formaldehyde resin modified as aggregate in succession, while using six
Curing agent of four amine aqueous solution of methine as phenol-formaldehyde resin modified, can avoid the use of methenamine, so as to reduce ammonia
Pollution；
2nd, the fast constrictive type precoated sand of the present invention is modified phenolic resin using Wheat Straw Lignin from Alkali Pulping and urea, while
Imidazoles and salicylic acid are added in precoated sand, can make obtained precoated sand that there is heat resistance and toughness；
3rd, the fast constrictive type precoated sand of the present invention is by the component of reasonable compatibility, and coordinates specific preparation method, makes to be made
Precoated sand speed hardening, and good mechanical performance.
Embodiment
It is the specific embodiment of the present invention below, technical scheme is further described, but the present invention is simultaneously
It is not limited to these embodiments.
Table 1：The component and part of 1-5 speed constrictive type precoated sands of the embodiment of the present invention
Embodiment 1
Weigh and be kneaded：Silicon sand is weighed, is heated to 150 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 50s and obtains mixture；The preparation method of the phenol-formaldehyde resin modified specifically comprises the following steps：By phenol, six
Four amine aqueous solution of methine, quality are added in formalin for the modifying agent of phenol quality 2.1%, mechanical agitation 3h, and are added
Enter ammonia spirit, temperature rising reflux 1h, adds ethylene glycol after decompression dehydration, discharge after stirring；The modifying agent is wooden for wheat straw alkali
The mixture of element and urea, and both mass ratioes are 1.2：1；The quality of the phenol is the 2.5% of natural silica sand quality；Institute
The quality for stating hexamethylenetetramine aqueous solution is the 1.25% of natural silica sand quality；The concentration of the hexamethylenetetramine aqueous solution
For 75%；The addition of the formalin and the mass ratio of phenol are 1.2：1, the mass fraction of the formalin is
37%；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；The flowing
The temperature of cooling agent is 40 DEG C；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
Embodiment 2
Weigh and be kneaded：Silicon sand is weighed, is heated to 155 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 52s and obtains mixture；The preparation method of the phenol-formaldehyde resin modified specifically comprises the following steps：By phenol, six
Four amine aqueous solution of methine, quality are added in formalin for the modifying agent of phenol quality 2.2%, mechanical agitation 3.2h, and
Ammonia spirit is added, temperature rising reflux 1.1h, adds ethylene glycol after decompression dehydration, discharge after stirring；The modifying agent is wheat straw alkali
The mixture of lignin and urea, and both mass ratioes are 1.25：1；The quality of the phenol is natural silica sand quality
2.55%；The quality of the hexamethylenetetramine aqueous solution is the 1.27 of natural silica sand quality；The hexamethylenetetramine is water-soluble
The concentration of liquid is 76%；The addition of the formalin and the mass ratio of phenol are 1.25：1, the quality of the formalin
Fraction is 39%；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；The flowing
The temperature of cooling agent is 42 DEG C；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
Embodiment 3
Weigh and be kneaded：Silicon sand is weighed, is heated to 160 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 55s and obtains mixture；The preparation method of the phenol-formaldehyde resin modified specifically comprises the following steps：By phenol, six
Four amine aqueous solution of methine, quality are added in formalin for the modifying agent of phenol quality 2.3%, mechanical agitation 3.5h, and
Ammonia spirit is added, temperature rising reflux 1.3h, adds ethylene glycol after decompression dehydration, discharge after stirring；The modifying agent is wheat straw alkali
The mixture of lignin and urea, and both mass ratioes are 1.3：1；The quality of the phenol is natural silica sand quality
2.65%；The quality of the hexamethylenetetramine aqueous solution is the 1.28% of natural silica sand quality；The hexamethylenetetramine water
The concentration of solution is 77%；The addition of the formalin and the mass ratio of phenol are 1.3：1, the quality of the formalin
Fraction is 41%；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；The flowing
The temperature of cooling agent is 45 DEG C；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
Embodiment 4
Weigh and be kneaded：Silicon sand is weighed, is heated to 165 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 58s and obtains mixture；The preparation method of the phenol-formaldehyde resin modified specifically comprises the following steps：By phenol, six
Four amine aqueous solution of methine, quality are added in formalin for the modifying agent of phenol quality 2.4%, mechanical agitation 3.8h, and
Ammonia spirit is added, temperature rising reflux 1.4h, adds ethylene glycol after decompression dehydration, discharge after stirring；The modifying agent is wheat straw alkali
The mixture of lignin and urea, and both mass ratioes are 1.35：1；The quality of the phenol is natural silica sand quality
2.7%；The quality of the hexamethylenetetramine aqueous solution is the 1.3% of natural silica sand quality；The hexamethylenetetramine is water-soluble
The concentration of liquid is 78%；The addition of the formalin and the mass ratio of phenol are 1.35：1, the quality of the formalin
Fraction is 37-45%；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；The flowing
The temperature of cooling agent is 48 DEG C；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
Embodiment 5
Weigh and be kneaded：Silicon sand is weighed, is heated to 170 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 60s and obtains mixture；The preparation method of the phenol-formaldehyde resin modified specifically comprises the following steps：By phenol, six
Four amine aqueous solution of methine, quality are added in formalin for the modifying agent of phenol quality 2.5%, mechanical agitation 4h, and are added
Enter ammonia spirit, temperature rising reflux 1.5h, adds ethylene glycol after decompression dehydration, discharge after stirring；The modifying agent is wheat straw alkali wood
The mixture of quality and urea, and both mass ratioes are 1.4：1；The quality of the phenol is the 2.8% of natural silica sand quality；
The quality of the hexamethylenetetramine aqueous solution is the 1.32% of natural silica sand quality；The hexamethylenetetramine aqueous solution it is dense
Spend for 79%；The addition of the formalin and the mass ratio of phenol are 1.4：1, the mass fraction of the formalin is
45%；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；The flowing
The temperature of cooling agent is 50 DEG C；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
Embodiment 6
With differing only in for embodiment 1, which uses phenolic resin, other and reality
Apply that example 1 is identical, and details are not described herein again.
Embodiment 7
With differing only in for embodiment 1, which uses common preparation process, other and reality
Apply that example 1 is identical, and details are not described herein again.
Comparative example 1
With differing only in for embodiment 1, which is common commercially available precoated sand, other and reality
Apply that example 1 is identical, and details are not described herein again.
Comparative example 2
With differing only in for embodiment 1, which uses common aggregate, other and embodiment
1 is identical, and details are not described herein again.
Comparative example 3
With differing only in for embodiment 1, the comparative example speed constrictive type precoated sand using methenamine as curing agent, its
He is same as Example 1, and details are not described herein again.
Comparative example 4
With differing only in for embodiment 1, without adding imidazoles in the comparative example speed constrictive type precoated sand, other and implementation
Example 1 is identical, and details are not described herein again.
Comparative example 5
With differing only in for embodiment 1, without adding salicylic acid in the comparative example speed constrictive type precoated sand, other and reality
Apply that example 1 is identical, and details are not described herein again.
Fast constrictive type precoated sand in embodiment 1-7 and comparative example 1-5 is subjected to performance detection, the testing result such as institute of table 2
Show.
Table 2：Fast constrictive type precoated sand test result in embodiment 1-7 and comparative example 1-5
It can be seen from the results above that present invention speed constrictive type precoated sand uses phenol-formaldehyde resin modified as aggregate in succession
Binding agent, while using curing agent of the hexamethylenetetramine aqueous solution as phenol-formaldehyde resin modified, methenamine can be avoided
Use, so as to reduce the pollution of ammonia；Meanwhile the fast constrictive type precoated sand of the present invention uses Wheat Straw Lignin from Alkali Pulping with urea to phenolic aldehyde
Resin is modified, while imidazoles and salicylic acid are added in precoated sand, can make obtained precoated sand have heat resistance and
Toughness.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or supplement to described specific embodiment or substitute in a similar way, but simultaneously
The spirit or beyond the scope of the appended claims of the present invention is not deviated by.
It is skilled to this area although having been made a detailed description to the present invention and being cited some specific embodiments
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of speed constrictive type precoated sand, it is characterised in that the speed constrictive type precoated sand specifically includes following parts by weight
Component：Natural silica sand：80-90 parts, phenol-formaldehyde resin modified：15-20 parts, salicylic acid：2-8 parts, imidazoles：2-5 parts, water：5-8 parts,
Fe3O4:2-5 parts, calcium stearate：5-10 parts.
A kind of 2. fast constrictive type precoated sand according to claim 1, it is characterised in that the preparation of the phenol-formaldehyde resin modified
Method specifically comprises the following steps：By phenol, hexamethylenetetramine aqueous solution, the modification that quality is phenol quality 2.1-2.5%
Agent is added in formalin, mechanical agitation 3-4h, and adds ammonia spirit, temperature rising reflux 1-1.5h, is added after decompression dehydration
Ethylene glycol, discharges after stirring.
3. a kind of fast constrictive type precoated sand according to claim 2, it is characterised in that the modifying agent is wooden for wheat straw alkali
The mixture of element and urea, and both mass ratioes are (1.2-1.4)：1.
4. a kind of fast constrictive type precoated sand according to claim 1, it is characterised in that the quality of the phenol is natural silicon
The 2.5-2.8% of chiltern amount.
A kind of 5. fast constrictive type precoated sand according to claim 1, it is characterised in that the hexamethylenetetramine aqueous solution
Quality be natural silica sand quality 1.25-1.32%.
A kind of 6. fast constrictive type precoated sand according to claim 1, it is characterised in that the hexamethylenetetramine aqueous solution
Concentration be 75-79%.
A kind of 7. fast constrictive type precoated sand according to claim 2, it is characterised in that the addition of the formalin with
The mass ratio of phenol is (1.2-1.4)：1, the mass fraction of the formalin is 37-45%.
A kind of 8. preparation method of fast constrictive type precoated sand as claimed in claim 1, it is characterised in that the preparation method tool
Body includes the following steps：
Weigh and be kneaded：Silicon sand is weighed, is heated to 150-170 DEG C, adds phenol-formaldehyde resin modified, imidazoles, water, salicylic acid, stearic acid
Calcium and Fe3O4, it is kneaded 50-60s and obtains mixture；
Remove caking：Mixture is crushed, through reciprocating sieve, then once mixture is obtained by flowing cooler；
Remove again：Once mixture is obtained into semi-finished product through reciprocating sieve again；
Weighing and bagging：Semi-finished product are obtained into finished product after weighing and packaging.
A kind of 9. preparation method of fast constrictive type precoated sand according to claim 8, it is characterised in that the flowing cooling
The temperature of agent is 40-50 DEG C.
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| WO2023033096A1 (en) * | 2021-09-02 | 2023-03-09 | 花王株式会社 | Binder composition for forming mold |
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Application publication date: 20180417 |